Nick, where did you find the plans? I don't know much about speaker building, but know that I could handle the actual fabrication and construction if I had a solid plan that didn't require me to figure out Q, tuning frequencies, attributes of drivers, etc.

Did you do this from scratch, or was it based upon a plan that said "Buy THIS particular driver, put it in an enclosure that's 3.9 cubic feet, and put a port of THIS width in THIS location", etc?